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https://issues.apache.org/jira/browse/FLINK-1618?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gyula Fora resolved FLINK-1618.
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Resolution: Implemented
> Add parallel time discretisation for time-window transformations
> -----------------------------------------------------------------
>
> Key: FLINK-1618
> URL: https://issues.apache.org/jira/browse/FLINK-1618
> Project: Flink
> Issue Type: Improvement
> Components: Streaming
> Reporter: Gyula Fora
> Assignee: Gyula Fora
>
> Currently discretizers for all windowing policies including time are executed
> with parallelism 1 when they define global windows. (for instance: sum of the
> last 10 minutes)
> While this is necessary for arbitrary policies like delta based or
> user-defined policies. Some discretizers such as Time can be implemented in a
> distributed fashion.
> Distributed time discretisers (and other types) can be implemented in the
> following way:
> -The discretisers should create StreamWindow s with incrementally increasing
> ID-s starting from the same value so that it is possible to merge them after
> the transformation
> - The partitioner for each discretizer should send the number of partitions
> created to the merger (the merger should be aware of the number of
> partitioners present to wait for all the information)
> - Based on all the partitioning info the merger can merge the windows
> properly afterwards
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